Consider the following news headline, \"Cigarette Smokers Make Lower College Gra
ID: 2909825 • Letter: C
Question
Consider the following news headline, "Cigarette Smokers Make Lower College Grades Than Nonsmokers." The article goes on to say that researchers at a university collected information on the rate of cigarette smoking (total number of cigarettes smoked in a one-month period) and the college student's current GPA for completed college courses. They found that those with higher levels of cigarette use had lower GPAs, and vice versa. What can you rightfully conclude from this? Why? Be specific about what this kind of information may indicate and mean.
Explanation / Answer
Sol:
correlation coefficient between the rate of cigarette smoking and college student's current GPA for completed college courses is positive
there exists a positive relationship between GPA and rate of cigarette smoking.
Form is linear
we can predict the GPA score given rate of cigarette smoking given regression equation.
GPA=a+b(rate of cigarette smoking).
GPA=dependent variable
rate of cigarette smoking=independent varaible
a=y intercept
b=slope
Install analysis tool pack in excel
go to excel data>data analysis >regression in excel.